Ornamental design for a belt buckle



FIG. 1 is a front elevational view of a belt buckle showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a side elevational view taken from the righthand side of FIG. 1; and

FIG. 4 is a rear elevational view.

The dominant feature of my invention resides in the representation of a moose lying within the border of a belt buckle. 

The ornamental design for a belt buckle, substantially as shown and described. 